Interesting. I think it lacks another means of pressure, like a time limit, a platform falling, or a border that keeps getting closer, forcing the player to go forward. Now that you have the main mechanic working, try to build around an aesthetic, a story (even if it's just basic). I think you would gain if you immerse the player and give him a goal and a reason to go in a loop. Try working on the game's feel, if you want the player to feel that the world is falling to corruption around him, and they have to survive, that would be good. Really good job for your first game!